7.51 – By remaking nature’s molecules, chemists can discover drugs and probe fundamental biology while pushing the boundaries of organic chemistry. We speak to Paul Clarke from the University of York, UK – Unpicking natural product synthesis

15.26 – Nasa’s Mars 2020 rover will take a small step towards helping us directly explore the red planet, by studying how to convert its carbon dioxide atmosphere to oxygen – Next Mars rover will make oxygen from CO2

21.52 – The efficiency of solar cells made using perovskite semiconductors has risen meteorically. But the question of whether their trajectory will take them from research to industry remains. We speak to Michael Grätzel from the Swiss Federal Polytechnic in Lausanne – The power of perovskites

31.46 – A test to detect counterfeit coffee – ground beans that have been bulked up with cheap, low quality filler ingredients – has been developed by scientists in Brazil – Catching criminals' coffee adulteration